fsk119 commented on code in PR #26630:
URL: https://github.com/apache/flink/pull/26630#discussion_r2127834307


##########
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/config/ExecutionConfigOptions.java:
##########
@@ -443,6 +443,36 @@ public class ExecutionConfigOptions {
                             "The max number of async retry attempts to make 
before task "
                                     + "execution is failed.");
 
+    // ------------------------------------------------------------------------
+    //  Async ML_PREDICT Options
+    // ------------------------------------------------------------------------
+
+    @Documentation.TableOption(execMode = 
Documentation.ExecMode.BATCH_STREAMING)
+    public static final ConfigOption<Integer> 
TABLE_EXEC_ASYNC_ML_PREDICT_BUFFER_CAPACITY =
+            key("table.exec.async-ml-predict.buffer-capacity")
+                    .intType()
+                    .defaultValue(100)
+                    .withDescription(
+                            "The max number of async i/o operation that the 
async ml predict can trigger.");

Review Comment:
   If the buffer is full, all messages from the upstream operator will be 
subject to backpressure. Flink has a detailed doc about the async io. Hope this 
can solve your questions[1]. I don't suggest users to adjust this value, 
recently, we are prepare a new FLIP about the rate-limit, which is much 
user-friendly.
   
   
[1]https://nightlies.apache.org/flink/flink-docs-master/docs/dev/datastream/operators/asyncio/



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